Issue with FFmpeg encode-decode examples for libvpx-VP9 ( v1.11.0)

[rohit khali]

I am trying to use encode_video.c and decode_video.c from https://github.com/FFmpeg/FFmpeg/tree/master/doc/examples to evaluate VP9 codec. However I'm getting "invalid frame marker issue" while decoding the encoded VP9 stream. Below are the required details. **** Encode example: I got a 25KB VP9 encoded stream, which I guess is RAW vp9 stream. [root at a28becddbffa encode]# ./encode_video enc.vp9 libvpx-vp9 *[libvpx-vp9 @ 0x1cf6040] v1.11.0* Send frame 0 ....... Send frame 24 .... Write packet 24 (size= 761) **** Decode Example:I've changed the codec_id to AV_CODEC_ID_VP9. [root at a28becddbffa decode]# ./decode_video enc.vp9 vp [Frame 1(352x288),codedPicNum=0, I] saving frame 1[352-384 x 288] [vp9 @ 0x1fb6300] Invalid frame marker Error sending a packet for decoding **** Any idea, what am I missing here.

[James Zern]

Hi,

On Mon, Jan 31, 2022 at 10:34 AM rohit khali <khali...@gmail.com> wrote:

I am trying to use encode_video.c and decode_video.c from https://github.com/FFmpeg/FFmpeg/tree/master/doc/examples to evaluate VP9 codec. However I'm getting "invalid frame marker issue" while decoding the encoded VP9 stream.

These produce and consume a raw bitstream, VP9 requires some framing. You can try the mux and demux examples instead or use the ffmpeg command directly.

 

Below are the required details. **** Encode example: I got a 25KB VP9 encoded stream, which I guess is RAW vp9 stream. [root at a28becddbffa encode]# ./encode_video enc.vp9 libvpx-vp9 *[libvpx-vp9 @ 0x1cf6040] v1.11.0* Send frame 0 ....... Send frame 24 .... Write packet 24 (size= 761) **** Decode Example:I've changed the codec_id to AV_CODEC_ID_VP9. [root at a28becddbffa decode]# ./decode_video enc.vp9 vp [Frame 1(352x288),codedPicNum=0, I] saving frame 1[352-384 x 288] [vp9 @ 0x1fb6300] Invalid frame marker Error sending a packet for decoding **** Any idea, what am I missing here.

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[rohit khali]

Hi James,

Thanks for the response.

Yes, Using mux-demux seems to be the one option here. I have to use FFmpeg APIs so the cmd option is ruled out.

But I am still wondering why the decoder is unable to decode this raw stream unlike other codecs like mpeg2, h264 and hevc. I have confirmed that encoded  bit stream is bit-exact to one wrapped within webm created by muxing code which I could playout in browser.

Is there any specific reason for 'external' dependency on putting framing in vp9 encoded bit stream.  

[root at a28becddbffa decode]# ./decode_video enc.vp9 vp [Frame 1(352x288),codedPicNum=0, I] saving frame 1[352-384 x 288] [vp9 @ 0x1fb6300] Invalid frame marker Error sending a packet for decoding

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[James Zern]

Hi Rohit,

On Tue, Feb 1, 2022 at 12:48 PM rohit khali <khali...@gmail.com> wrote:

Hi James,

Thanks for the response.

Yes, Using mux-demux seems to be the one option here. I have to use FFmpeg APIs so the cmd option is ruled out.

But I am still wondering why the decoder is unable to decode this raw stream unlike other codecs like mpeg2, h264 and hevc. I have confirmed that encoded  bit stream is bit-exact to one wrapped within webm created by muxing code which I could playout in browser.

Is there any specific reason for 'external' dependency on putting framing in vp9 encoded bit stream.  

Aside from a key frame, there's no real sync code in the bitstream (and even that one isn't guaranteed to be unique), so an application needs to packetize the frames.

 

[root at a28becddbffa decode]# ./decode_video enc.vp9 vp [Frame 1(352x288),codedPicNum=0, I] saving frame 1[352-384 x 288] [vp9 @ 0x1fb6300] Invalid frame marker Error sending a packet for decoding

On Tue, Feb 1, 2022 at 12:56 AM 'James Zern' via WebM Discussion <webm-d...@webmproject.org> wrote:

Hi,

On Mon, Jan 31, 2022 at 10:34 AM rohit khali <khali...@gmail.com> wrote:

I am trying to use encode_video.c and decode_video.c from https://github.com/FFmpeg/FFmpeg/tree/master/doc/examples to evaluate VP9 codec. However I'm getting "invalid frame marker issue" while decoding the encoded VP9 stream.

These produce and consume a raw bitstream, VP9 requires some framing. You can try the mux and demux examples instead or use the ffmpeg command directly.

 

Below are the required details. **** Encode example: I got a 25KB VP9 encoded stream, which I guess is RAW vp9 stream. [root at a28becddbffa encode]# ./encode_video enc.vp9 libvpx-vp9 *[libvpx-vp9 @ 0x1cf6040] v1.11.0* Send frame 0 ....... Send frame 24 .... Write packet 24 (size= 761) **** Decode Example:I've changed the codec_id to AV_CODEC_ID_VP9. [root at a28becddbffa decode]# ./decode_video enc.vp9 vp [Frame 1(352x288),codedPicNum=0, I] saving frame 1[352-384 x 288] [vp9 @ 0x1fb6300] Invalid frame marker Error sending a packet for decoding **** Any idea, what am I missing here.

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[rohit khali]

Thanks a lot James !!

This information helps to have the initial context of vp9. 

Regards,

Rohit Khali

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